Class 12 Biology Ch 6 | Molecular Basis of Inheritance Part 3 | Important Questions & Answers 2026

Описание: Class 12 Biology Chapter 6 – Molecular Basis of Inheritance (Part 3)
In this video, we cover the most important questions and answers for the 2026 Board Exam from this chapter.
These include detailed explanations of:
1️⃣ What is Promoter and its Function
2️⃣ Function of mRNA, tRNA, and rRNA
3️⃣ Structure of DNA according to Watson and Crick Model
4️⃣ DNA Replication with Example and Diagram

This video is perfect for revision before exams and helps you write complete NCERT-based answers in your board exams.

🔥 Watch till the end to score 90+ marks

Q1. What is promoter and what is its function?
➡️ Promoter is a specific DNA sequence where RNA polymerase binds to initiate transcription.
It controls the start of gene expression.

Q2. Function of mRNA, tRNA, and rRNA:

mRNA: Carries genetic information from DNA to ribosome.

tRNA: Brings amino acids to ribosome for protein synthesis.

rRNA: Forms structural and functional part of ribosome.


Q3. Structure of DNA according to Watson and Crick model:
➡️ DNA is a double helix made up of two complementary strands running antiparallel. Each strand has nucleotides with sugar, phosphate, and nitrogen bases (A, T, G, C). A pairs with T and G pairs with C via hydrogen bonds.

Q4. Explain DNA replication with example and diagram:
➡️ DNA replication is semi-conservative — each daughter DNA molecule has one parental and one new strand.
The enzyme DNA polymerase helps in adding nucleotides.
Example: Replication of E. coli DNA.



📚 For Class 12 Biology Students (CBSE, ISC, State Boards)

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